武汉理工大学学报(交通科学与工程版)
武漢理工大學學報(交通科學與工程版)
무한리공대학학보(교통과학여공정판)
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY(TRANSPORTATION SCIENCE & ENGINEERING)
2014年
1期
103-106
,共4页
熊云峰%陈章兰%叶家玮
熊雲峰%陳章蘭%葉傢瑋
웅운봉%진장란%협가위
内应力%结构%动力学性能%理论及数值验证
內應力%結構%動力學性能%理論及數值驗證
내응력%결구%동역학성능%이론급수치험증
internal stress%complex structure%dynamic performance%theory study and numerical veri-fication
采用有限元法,从具有内应力的单元物理方程出发,推导出内应力对刚度产生影响,进而建立了内应力对结构模态影响程度的表达式。以二节点杆件为例,通过对比有无内应力情况下刚度矩阵,证实内应力不仅影响结构刚度,进而使结构振动固有频率发生偏离。而且,还会滋生出新的振动模态,验证了内应力影响模态理论的准确性;以焊缝的残余应力作为内应力实例,船体舱段为结构实例,比较不同焊接残余应力水平下结构二阶垂向振动的频率,数值验证了内应力对结构模态的影响。
採用有限元法,從具有內應力的單元物理方程齣髮,推導齣內應力對剛度產生影響,進而建立瞭內應力對結構模態影響程度的錶達式。以二節點桿件為例,通過對比有無內應力情況下剛度矩陣,證實內應力不僅影響結構剛度,進而使結構振動固有頻率髮生偏離。而且,還會滋生齣新的振動模態,驗證瞭內應力影響模態理論的準確性;以銲縫的殘餘應力作為內應力實例,船體艙段為結構實例,比較不同銲接殘餘應力水平下結構二階垂嚮振動的頻率,數值驗證瞭內應力對結構模態的影響。
채용유한원법,종구유내응력적단원물리방정출발,추도출내응력대강도산생영향,진이건립료내응력대결구모태영향정도적표체식。이이절점간건위례,통과대비유무내응력정황하강도구진,증실내응력불부영향결구강도,진이사결구진동고유빈솔발생편리。이차,환회자생출신적진동모태,험증료내응력영향모태이론적준학성;이한봉적잔여응력작위내응력실례,선체창단위결구실례,비교불동한접잔여응력수평하결구이계수향진동적빈솔,수치험증료내응력대결구모태적영향。
Proceeding from physical equation with internal stress ,the influence of initial stress on stiff-ness of structure was developed by FEM method and principal virtual work ;further ,the influence amplitude of internal stress on dynamical performance of structure was established by matrix norm a l-gorithm .The developed work was verified visually by structure example of two -node link and veri-fied numerically by example of ship hull structure with welding residual stress regarded as internal stress .T he research result indicates that the influence of initial stress on the behavior of vibration and could not be ignored if accuracy of vibration control of hull structure is deemed necessary .